Steam-generator.



J. MEIKLE.

STEAM GENERATOR.

APPLIOATION FILED Ammo, 1914.

1,1 12,463. Patented Oct. 6, 1914.

IHE NORRIS PEIERS 1.0.. PHOTO-LH'HO.. WASIIINGION, 11.

JAMES MEIKLE, OF GLASGOW, SCOTLAND.

STEAM-GENERATOR.

Specification of Letters Patent.

Patented Oct. 6, 1914.

Application filed April 20, 1914. Serial No. 833,215.

To all whom it may concern Be it known that 1, JAMES hlniKLn, a subjectof the King of the United Kingdom of Great Britain and Ireland, andresiding at Maryhill, Glasgow, Scotland, have invented a certain new anduseful Improvement in Steam-Generators, of which the following is aspecification.

This invention relates to a steam generator of the type comprising anupper steam and water drum, a lower water drum traversed by verticalfire tubes and an intermediate smoke-box through which is led adowncomer tube serving for passage of feedwater and extending from theupper drum to about the lower end of the lower drum, the drums alsobeing connected by return tubes.

According to the present invention, to provide for improved circulation,the said downcomer tube is arranged to receive the lower end of a feedwater inlet pipe, while the return tubes are located outside thesmoke-boX and connect the lower end of the upper drum with the upper endof the lower drum.

In the accompanying drawings Figure 1 is a part vertical section partside elevation of asteam generator constructed in accordance with theinvention; and Fig. 2 is a section on the line A-A Fig. 1.

As shown, the steam generator comprises two superposed boiler sections 1and 2 with an interposed smoke-box 3, the lower section 1 being locatedover the furnace d. The lower section 1 constructed somewhat after themanner of an ordinary evaporator is constituted by an uprightcylindrical shell, the ends of which are formed as tube plates intowhich are expanded the ends of tubes 5 constituting fire tubes. Theupper end of the lower section 1 is also formed with a large centralaperture through which is led a wide open-ended tube 6 extending to thevicinity of the bottom of said lower section 1. The upper part of thetube 6 extends through the smoke-box 3 into the upper boiler section 2which latter serves as a steam and water drum, the upper end of the tube6 being located below the water level inside said drum.

Gopies 0! this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Dipping into the tube 6 is a feed water pipe 7 led through the uppersection 2 and terminating at a point intermediate the sections 1 and 2.The feed water pipe 7 delivers a downwardly directed supply of feedwater into the tube 6. One or more return pipe connections 10 disposedexternally of the smoke-box is or are provided between the lower end ofthe upper section 2 and the upper end of the lower section 1, so as toafford a complete circulating system. The furnace 4 is made suflicientlydeep to permit any of the fire tubes 5 to be drawn downwardly into thefurnace pit, if and when required.

The steam generator proper is mounted to run on rails 11 so that thesame may be wheeled out of register with the furnace for inspection thepurposes of said rails serving also as guides for a truck by means ofwhich fuel may be delivered to the furnace. Located intermediate therails is a fuel receiving chute 12 which serves to deliver the fueldeposited therein from the truck into a conduit 13 constituting the fuelinlet of the furnace and equipped with helical conveyers 14- serving tofeed the fuel into said furnace. It will be understood that the furnaceis also adapted for oil firing.

I claim A steam generator comprising two superposed boiler sections thelower of which is fitted with fire tubes, a smoke-box separating saidsections, return tubes outside said smoke-box, said return tubesconnecting the upper end of the lower section with the lower end of theupper section, a depending tubular element traversing said smoke-box andserving to lead feed water to the lower section, and a feed water inletpipe leading into said tubular element.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JAMES MEIKLE.

Witnesses:

DOUGLAS KEITH FAIRWEATHER, HENRY MASON.

Washington, D. G.

